Re: CMake misidentifies xlc++ as Clang

Hi.

1. You can report this issue on the CMake gitlab (
https://gitlab.kitware.com/cmake/cmake/issues ). You will want to
attach the result of dumping all defines from the compiler ( xlc++ -dD
-E - < /dev/null or xlc++ -dM -E ). Currently it looks like we are
using '__IBMCPP__' to detect xlc++, and that might not be defined on
the power pc platform.